She faced court on Friday for a bail hearing.
Lines was refused bail and remains in custody in Palau as South Australian detectives seek her extradition.
Her former partner Zacharia Bruckner, 30, was also arrested in Brisbane on Thursday and charged with attempted murder and two counts of conspiracy to murder.
He was extradited to Adelaide on Friday to face court on the charges.
Lines and Bruckner, who are alleged to have been in a former relationship, are accused of plotting to murder her ex-husband Jonathan Hawtin.
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In 2017, Hawtin was seriously injured and left a tetraplegic after he was allegedly attacked with an axe.
In the same incident, Bruckner suffered a gunshot wound to the abdomen, which police now allege was self-inflicted to stage a self-defence case.
Hawtin was initially charged with attempted murder but was acquitted at trial.
It is also alleged Lines and Bruckner as recently as 2023 plotted to hire a contract killer to silence Hawtin and his mother.
Lines is also accused of sending a female lover to suffocate Hawtin while he was in a rehabilitation centre after the 2017 axe incident.